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Subclinical Postpartum Renal Structure After Hypertensive Pregnancy Disorders.

Hannah R Cutler1, Jamie Kitt1,2, Prenali D Sattwika1,3

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|August 31, 2025
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Summary

Women with preeclampsia had smaller kidney volumes postpartum, indicating potential long-term renal changes. This finding aids in identifying future kidney disease risk after hypertensive pregnancies.

Keywords:
hypertensionkidneymagnetic resonance imagingpostpartum periodpre-eclampsia

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Area of Science:

  • Nephrology
  • Obstetrics
  • Radiology

Background:

  • Hypertensive pregnancies increase risks for maternal renal failure.
  • Postpartum traditional renal markers normalize, hindering identification of future disease risk.
  • Investigating postpartum renal structure in relation to hypertensive pregnancy types is crucial.

Purpose of the Study:

  • To determine if hypertensive pregnancy type and severity correlate with postpartum renal structure.
  • To assess kidney volume and corticomedullary differentiation 6-12 months postpartum.
  • To identify potential biomarkers for long-term renal risk after hypertensive pregnancies.

Main Methods:

  • Magnetic resonance imaging (MRI) was used to assess renal structure in 125 women 6-12 months postpartum.
  • Women were categorized into preeclamptic, gestational hypertension, and normotensive groups.
  • Kidney volume and corticomedullary differentiation were compared between groups.

Main Results:

  • Preeclamptic women had smaller postpartum kidney volumes compared to gestational hypertension and normotensive groups (P=0.049).
  • Smaller kidney volumes correlated with lower estimated glomerular filtration rate (eGFR) at delivery (P<0.001).
  • Corticomedullary differentiation differed significantly in gestational hypertension compared to preeclamptic (P=0.02) and normotensive (P=0.007) women.

Conclusions:

  • Preeclampsia is associated with reduced kidney volume 6-12 months postpartum.
  • Smaller kidney volumes post-preeclampsia correlate with reduced renal function at delivery.
  • Renal structure differences postpartum may indicate varying long-term renal risks.